Error 551- Users Is Not Local – Causes and Fixes
User is not local. This means that both your address and recipients address are not locally facilitated by the server,...
SMTP
Simple Mail Transfer Protocol Error Codes
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Error 553 Request Action Not Taken – Causes and Fixes
Request action not taken. The receiving email server could not check the email address and there is an incorrect email... -
Error 554 Transaction Failed – Causes and Fixes
This implies the exchange has error. It is a permanent error and the server would not attempt to send the... -
Error 552 – Exceeded Storage Allocation – Causes and Fixes
Causes the size of the attachment in the email is too large for the server to handle based on the...